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LM555CN bảng dữ liệu(PDF) 4 Page - Fairchild Semiconductor |
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LM555CN bảng dữ liệu(HTML) 4 Page - Fairchild Semiconductor |
4 / 13 page LM555 4 Application Information Table 1 below is the basic operating table of 555 timer: When the low signal input is applied to the reset terminal, the timer output remains low regardless of the threshold voltage or the trigger voltage. Only when the high signal is applied to the reset terminal, the timer's output changes according to threshold voltage and trigger voltage. When the threshold voltage exceeds 2/3 of the supply voltage while the timer output is high, the timer's internal discharge Tr. turns on, lowering the threshold voltage to below 1/3 of the supply voltage. During this time, the timer output is maintained low. Later, if a low signal is applied to the trigger voltage so that it becomes 1/3 of the supply voltage, the timer's internal discharge Tr. turns off, increasing the threshold voltage and driving the timer output again at high. 1. Monostable Operation Table 1. Basic Operating Table Threshold Voltage (Vth)(PIN 6) Trigger Voltage (Vtr)(PIN 2) Reset(PIN 4) Output(PIN 3) Discharging Tr. (PIN 7) Don't care Don't care Low Low ON Vth > 2Vcc / 3 Vth > 2Vcc / 3 High Low ON Vcc / 3 < Vth < 2 Vcc / 3 Vcc / 3 < Vth < 2 Vcc / 3 High - - Vth < Vcc / 3 Vth < Vcc / 3 High High OFF 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 10 1 10 2 10 -3 10 -2 10 -1 10 0 10 1 10 2 Time Delay(s) Figure 1. Monostable Circuit Figure 2. Resistance and Capacitance vs. Time delay(td) Figure 3. Waveforms of Monostable Operation 1 5 6 7 8 4 2 3 RESET Vcc DISCH THRES CONT GND OUT TRIG +Vcc RA C1 C2 RL Trigger |
Số phần tương tự - LM555CN_12 |
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Mô tả tương tự - LM555CN_12 |
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